We regularly get infected by various rhinoviruses which are very similar to coronaviruses.
Said rhinoviruses keep returning because the antibodies fade over time and the initial infections aren't general severe enough to trigger a more aggressive and longer lasting response in the first place, so getting a cold sucks, but trying to hit the various different moving targets each year as the different remnant caches in each population take turns spreading and retreating for a few days of sneezing and bleary feeling with a mild coof coof just doesn't end up seeming worth it.
Sometimes with a flu strain, even as a young non-smoker you really feel that while you probably won't die... it might be a nice break from this goddamn wracking cough and being too sore to do anything but rest but you're too achy to actually fall asleep between coughing fits. Next time somebody says "it's just like the flu" they should be popped in the nose good and hard, the flu sucks you stupid cunts. I'll take it over an abscessed molar or sinus infection--both of which are tied at the 10 spot on my pain scale, nut kicks have slid to like a 5 or 6 now, and rasping a knuckle is a solid 3 or 4, while my worst flu has been around a 3 or 4 steady with coughing spikes to a 5--at least with the flu I've never noticed losing stretches of time due to pain so overwhelming all I can remember is a hateful white emptiness of agony with no real recollection of how long it lasted, just memories of realizing I was screaming without knowing why.
So sure, the flu isn't as bad as that but I'd be cool with never catching it again, and the idea of getting another deep fucking lungache infection sounds around as fun as getting shot.
Sure, COVID-19 can apparently be a mild "was that it, really?" like a more coughy-than-usual-cold, it can also end up kicking your ass like the flu on steroids, and that's if you don't get the massive cytokine storm shit where your body just zerg rushes itself trying to fight off the virus and drowning in your own lungs becomes a serious fucking risk.
Let's not forget the people who started out with a fairly severe-but-not-fatal gamut of symptoms, start thinking they're coming back out of it, and then kinda wobble back and forth between "walking to the bathroom left me wanting to fall over and die once I stop coughing" and "fever is almost gone and lungs barely hurt... maybe it's almost over" for weeks or more apparently.
Thankfully those aren't a super common outcome (if you can call lingering in sickness limbo for who the fuck knows how long an outcome) but it's yet another thing to remember is on the chart of outcomes if you roll those dice.